Curious, Derrick felt the swollen teats and was immediately positioned so that he could reach them with his mouth. The bear wanted him to nurse! What did bear milk taste like, anyway? It wouldn't hurt to try just a little. His lips closed around the teat and pulled. He didn't get anything at first, but some old memory helped him figure out nursing and a squirt of warm liquid shot into his mouth. It was thicker and richer than cow's milk, and had a curious taste that he wasn't quite sure about. One more squirt and it tasted pretty good, and before Derrick realized what was happening, he had started nursing in earnest.
The bear held him to her chest, licking the top of his head as he got sleepy, feeling comfortable and full. When he finally let the teat pull free of his muzzle, he grunted and burped, and nestled into the fur of her mother...
Huh? Derrick twisted to look at herself. She was a very young bear cub, with no trace of her human past evident. And the lack of anything between her hind legs confirmed what she had changed sex along with species. Well, it didn't make much difference for a cub anyway - male or female, she was a long way from sex.